I have a folder containing files like

radiobutton-clicked.png
radiobutton-foobar.png
radiobutton-foobarbaz.png
... etc.

This is what happens when I search in Windows Explorer:

• radio: all files found
• radio*: all files found
• *button: all files found
• *radiobutton*: all files found
• radiobutton*: no results
• radiobutton: no results
• radio*button: all files found

So what the hell does the * precisely do? Is there some documentation on this?

And why does radio and radio*button work as a search term, but radiobutton not?

Edit:

I know that * is usually supposed to be a wildcard matching 0 or more characters. But obviously it doesn't in this case.